Scouring gun



May 8, 1956 we. LARSON ET AL 2,744,361

SCOURING GUN Filed May 14, 1954 2 Sheets-Sheet 2 IN VEN TOR.

ARA/aw 11/. 6.14160 BY Alanna/u. 7.72475 14 rrokwsrs I nesota the tubularnmember' in de M com UN";

Arnold w. G! Larson afnd 'Nordahl T, Flaten, Minneapolis, 'Minrn, assignors to Tobin-'Arp Manufacturing Company, Minneapolis, Minn.,..a corporation of Min- Application Ma 14,1954 ,-SerialNo. 429,723 I 44 claims.,, c1 sit-"1 1 The invention herein'has relation ,tofla, gun for scouring articles of various types, andiitsobjectnis, to provide a new andaimproved gun devised ,to be especially-u in the arts to cleansuch, articles ;as pistons, valves, brake shoes, etc... 1. A I

f This application'fis a continuation,- inpart of the disclosure of our pendingapplication Serial No. 396,014, for Apparatus for Cleaning Artic1es, filed December 3, 1953, and presents novelrand improved lfatures andcharacter-v istics of. construction; relating to scouring guns additional to those illustrated anddescribed in said disclosure a In the acco'ipariying drawings forming' 'apart of this specification,

I 'Fig. 1 isa top'planiview a scouring fg'uh made according to the inyention; 7

7 Fig. 2.is a side'elevational view of "the disclosure of Fig/1;

Fig. 3.isia 33inFig .-1';'

ihal sectional;- view, taken on" line Fig. 4 is 'a detailfsectioualfiiew Lcoirrespohding with the disclosure of a part of thel scouringgun adjacent the rightinFig.3; a

Fig. -5 ,.is atransverse sectional view,tal en as on line 5-5 in Fig. 4; I

, Fig. 6 is aview-o a scouring,guni hf modifiedcon v struction incorporating features and characteristics of the invention disclosing asgrip piece and barrel of saidscouringi gunfin, longitudinal; section and a, discharge nozzle of the gunas it would appearfromtheftop of the sheet in v Fig. 7 is a detail sectionalyiew, vtaken ason line 7-7 inFig.,6;a'nd I 1'. Fig-:8 is ia'detail s ctionalview, tak'euon line 8 t; in'Fig.6. 1 I; a r

With .respectlto Figsof the drawings,;the scouringj'gun there shown ludes va barrel 10, with roughened gr'ppieces'fl iupo theloppgsiteside thereof,

and anozzle'12 atthe,outeriendofsaidbarrel A flexible'air. cpnveying.pipe 13, ,to leadfrom a source (not shownyof air under pressure, opens tofairpoutlet passage 14 disposed la'tgan upper portion and extending longitudinally of; the barrel 1 The. air outlet'passage 141s open' ltoj cenaau disposedport' 15 in the inner;

adjacent end; portion of,atubular element of the-nozzle 12, and said tubular .element-is integral with the barrel 10. An end portion off-said tuhularelement having the port 15 is in longitudinal'alinernent withfsaid barrel, and said port opens at its outer end,-;or, end spaced from the barrel, to a chamber 16, concentric witlrandof diameter larger, than the port situated irlj an'outer end portion of 'n'ed relation with an outerf end' portion off'said portfand ih'obliquerelation to and extend situatedin'the chamber 16.

"A ffl'e 'bleconveying'pipe'-19 for slurry,to lead from "ice Patented May 8, 1956 let passage 20 for slurry, in the barrel 10 and theinnen end portion of the tubular element of the nozzle 12"at An outlet plug of the nozzle 12, of hard rubber as disclosed, includes an inner end portion 22 snugly fitted into an outer end portion of the tubular element ofsaid nozzle in contiguous'relation to the chamber 16 and an outer' portion 23 which extends forwardly andtdownwardl'y. A

protuberance 24, upon a side surface of the inner end portion 22 of the outlet plug and fitted into an opening 25 in the tubular element of the nozzle, retains an in-I'" wardly facing shoulder 26 of said outlet plug, between its inner and outer end portions, against the forward end of said tubular element. The innerend 27 of the inner end portion 22 of the outlet plug is of conical configuration and slants interiorly,- toward the longitudinal] axis of said outlet plug, and forwardly,;awa'y fromthe venturi. Said inner end 27 is in concentric relation to said venturi. The outer end of the venturi integrally supports alflared flange or member 28 which extends exteriorly, away from the axis of the outlet plug, and forwardly, away from said venturi. A forward, exterior annular marginal'surface 29 of the flared flange or member 28, engages a rear-f ward, exterior annular marginal surface of the inner end,

27 of the inner end portion 22 of theoutlet p1ug,- and ports 30 through said flared flange; or rnember connect the chamber 16 with anoutletfpas sage' 31 throughsaid outlet plug. There are'fourportsiill. as disclosed, at 9 0?- apart, and each of said ports is situated-exteriorly ofth e venturi and interiorly of the exterior, annular marginalsurface 29. The venturi 17 andthe flare flange or member 28 separate the chamber16 from the outlet passage 31 save by way of the port's 30. Stated'diiferently, the only slurry which can pass from said chamber 16 to the outlet passage '31 is that which enters said outlet passage by way of saidports' 30. As will be clear from Figs.

3 and 4, the slurryv outlet ,p'a'ssagei2t) communicates with the chamber 16 at the forward side of the inner end of the venturi and at the rearward side of the flaredflange or member 28. That is to say, the construction and. arrangement are such that travel of slurry from said outlet passage 20 to the outlet passage 31 is by way of the chamber 16 and the ports 30. The outlet passage 31 is concentric and in longitudinal alinement with the venturi 17 and of greater diameter than is said venturi ,As disclosed, each port 30 the venturi.

respense to passage of air under pressure through the con- .veying pipe 13, the outlet passage 14 and the venturi 17.

As air'unde'r pressure travels through the venturi, its

' rate'of flow will be greatly accelerated to cause pressure geheralljddwnwardly from the barrel 1 0, A'venturi 17 has its inner end portion threaded, asj a't"18, in. the goutereiidof the port 15 'andfits body pjortion centrally of air in the chamber 16 of the tubular element of the nozzle 12 to be reduced .to pressure below atmospheric pressure, thus to cause slurry to be drawn or sucked into said chamber, by way of the slurry conveying pipe 19 and theoutlet passage 20, and then into the outlet passage 31,

by way of the ports 30. Slurry which enters saidoutletpassage 31 will be forced out of thescouring gun by and I with air under pressure which entersflthe outlet plug, from.

the venturi. The magnitude of the blast of the jet of slurry and air will be at its maximum a short distance in advance of, or away from, said outlet plug. The construction and arrangement as disclosed, including the venturi 17, the chamber 16 and the flared flange or member 28 with ports 30, provides a jet of slurry and air wherein the slurry is distributed uniformly throughout thecolumn of 7 air as the jet is forced from the outlet plug.

is of smallerdiameter thanis The scouring gun disclosed in Figs. 6, 7 and 8 includes a grip piece 40, a barrel 41 rigid with and perpendicular to said grip piece, and a nozzle 42 at the outer end of the barrel.

A flexible air conveying pipe 43, to lead from a source (not shown) of air under pressure, opens to an air inlet passage 44 through the grip piece 40, and said air inlet passage 44 opens to an air outlet passage 45 disposed centrally and extending longitudinally of the barrel 41. The air outlet passage 45 is open to a centrally disposed port 46 in the inner, adjacent end portion of a tubular element of the nozzle 42, and said tubular element is rigid with the barrel 41. An end portion of the tubular element of the nozzle 42 having the port46 is in longitudinal alinement with said barrel, and said port 46 opens at its outer end, or end spaced from the barrel, to a chamber 47, concentric with and of diameter greater than the port 46, situated in an outer end portion of said tubular element of the nozzle in alined relation with an outer end portion of said port 46 and in oblique angle relation to and extending generally downwardly from the barrel 41. A venturi 48 has its inner end portion fixed in the outer end of the port 46 and its body portion situated in the chamber 47.

A flexible conveying pipe 49 for slurry, to lead from a suitable source (not shown) of slurry, opens to an inlet passage 50 through the grip piece 40, at a side of the air inletpassage 44. The slurry inlet passage 50 opens to an annular outlet passage 51 for slurry in surrounding relation to the air outlet passage 45, and said annular outlet passage for slurry opens by way of longitudinal outlet ports 52, at opposite sides of the air outlet passage 45 and the venturi 48, to the chamber 47 Said chamber 47 is of annular configuration and in surrounding, concentric relation to said venturi 48.

An outlet plug of the nozzle 42, of hard rubber as disclosed, includes an inner endportion 53 snugly fitted into an outer end portion of the tubular element of said nozzle 42 in contiguous relation to the chamber 47 and an outer end portion 54 which extends forwardly and downwardly. A screw member 55 upon the forward end of the nozzle tubular element retains the outlet plug in said tubular element. A base of the screw member is engaged against the forward or outer end of the inner end portion of'the outlet plug and includes a central opening 56 in which the outer end portion 54 of said outlet plug is situated. The inner end 57 of the inner end portion 53 of the outlet plug is of conical configuration and slants interiorly, toward the longitudinal axis of said outlet plug, and forwardly, away from the venturi 48. Said inner end 57 is in concentric relation to said venturi. The outer end of the venturi is open to an outlet passage 58 through the outlet plug and also in alined relation transversely of the nozzle with a rearward, exterior annular marginal surface 59 of the inner end 57 of the inner end portion 53 of said outlet plug. The outlet passage 58 is concentric and in longitudinal alinement with the venturi 48 and of greater diameter than is said venturi.

Ejection of slurry from the outlet passage 58 will be in response to passage of air under pressure through the con-. veying pipe, the inlet passage 44, the outlet passage 45, and the venturi 48. As air under pressure travels through said venturi, its rate of flow will be greatly accelerated to cause pressure of air in the chamber 47 to be reduced to pressure below atmospheric pressure, thus to cause slurry to be drawn o1 sucked into said chamber, by way of the slurry conveying pipe 49, the inlet passage 50, the annular outlet passage 51 and the outlet ports 52, and then into the outlet passage 58. Slurry which enters saidoutlet passage 58 will be forced out of the scouring gun by and with air under pressure which enters the outlet plug from the venturi 48. As in the case of the scouring gun of Figs. 1 to 5, the magnitude of the blast ofthe jet of slurry and air will be at its maximum a short distance forwardly of the outlet plug.

What is claimed is:

1. A scouring gun comprising a barrel, a tubular element rigid with an outer portion of said barrel and providing a chamber, a plug rigid with an outer portion of said tubular element and having an outlet contiguous with said chamber, a conveying pipefor slurry leading by way of a first passage outwardly of the barrel to said chamber, a conveying pipe for air leading by way of a second passage outwardly of said, barrel past the chamber to said plug outlet, a venturi in said chamber in spaced relation to said tubular element and in contiguous relation to said first passage and said plug outlet, and a member situated inwardly of the plug between an outer portion of said venturi and the inner end of said plug cooperating with the venturi to separate the .chamber from said second passageway and said, plug outlet save for spaced ports through said member, an outer surface of said member being in proximate relation with the inner end of said plug and said venturi being responsive to flow of air under pressure through said secondpassage to the plug outlet to induce flow of slurry by way of said first passage, said chamher and said ports into said plug outlet.

2. A scouring gun comprising a barrel, a tubular ele ment rigid with an outer portion of said barrel and providing a chamber, a'plug rigid with an outer portion of said tubular elementand having an outlet contiguous with a rearward, forwardlyand interiorly extending conical end surface of said plug itself contiguous with and in concentric relation to the chamber, a conveying pipe for slurry leading by way of a first passage outwardly of the barrel to said chamber, a conveying pipe for air leading by way of a second passage outwardly of said barrel past the chamber to saidplug outlet, a venturi in said chamber in spaced relation to said tubular element and in contiguous relation to said first passage and said conical end surface of said plug, and a member situated inwardly of the plug between an outer portion of said venturi and an exterior marginal portion of said conical end surface of the plug cooperating with the venturi to separate the chamber from said second passageway and said plug outlet save for spaced ports through said member, an outer surface of said member being in proximate relation with the inner end of said rearward conical end surface of said plug and said venturi being responsive to flow of air under pressure through said second passage to the plug outlet to induce flow of slurry by way of said first passage, said chamber and said ports into said outlet.

3. A scouring gun comprising a barrel, a tubular element rigid with an outer portion of said barrel and providing a chamber, a plug rigid with an outer portion of said tubular element and having an outlet contiguous with said chamber, a conveying pipe for slurry leading by way of a first passage outwardly of the barrel to said chamber, a conveying pipe for air leading by way of a second passage outwardly of said barrel past the chamber to said plug outlet, and a venturi in said chamber in spaced relation to said tubular element and in contiguous relation to said secondpassag'e and separating the second passage from the chamber, said venturi being in alined, contiguous relation to said plug outlet and having an outer end thereof in alinement transversely of said tubular element with the inner end of the plug outlet, and the ven turi being responsive to flow of air under pressure through the second passage to said plug outlet to induce flow of slurry by way of said first'passage and said chamber into the plug outlet.

4. A scouring guncomprising a barrel, a tubular element rigid with an outer portion of said barrel and providing a chamber, a plug rigid with an outer portion of said tubular element and having an outlet contiguous with a rearward, forwardlyand interiorly extending conical end surface of said plug itself contiguous with and in concentric relation to the chamber, a conveying pipe for slurry leading by way of a first passage outwardly of the barrel to said chamber, a conveying pipe for air leading by way of a second passage outwardly of said barrel past the chamber to said plug outlet, and a venturi in said chamber in spaced, concentric relation to said tubular element and in contiguous relation to said second passage and separating the second passage from the chamber, said venturi being in alined, contiguous, concentric relation to said conical end surface of said plug outlet and having an outer end thereof in alinement transversly of said tubular element with the inner end of said rearward conical end surface of the plug outlet, and the venturi being responsive toflow of air under pressure through the second passage to said plug outlet to induce flow of slurry by way of said first passage and said chamber to the plug outlet.

References Cited in the file of this patent UNITED STATES PATENTS Swann Dec. 9, 1930 Forster Mar. 8, 1932 Pletcher Feb. 23, 1937 Pletcher Feb. 1, 1938 Keefer Feb. 13, 1945 Morel May 23, 1950 Sargrove Aug. 29, 1950 Crumley Apr. 29, 1952 Uhri- Aug. 5, 1952 Chalom Jan. 19, 1954 

